I've seen this in Precise (the alpha version too), both in JWM and Openbox: when I right-click a file from ROX and select either Copy, Rename, or Move (several times, the one I use more frequently is Copy), the screen turns black, showing only the taskbar, then if I try to use other programs the taskbar disappears and all is finally black. I restart X and keep doing things as usual, then after many times copying files from ROX right-click menu I get the black screen again.

vicmz,
With ROX, I just drag a file, then when I release the left-button a menu pops up asking whether want to copy, move or link.
Does this way work OK for you?

Yes, it does. I usually copy that way, and use the right-click menu when it's a single file. Renaming a file, however, doesn't have a second option (not one that doesn't imply a second application, at least), yet the bug is so weird you can't tell when the screen will turn black after clicking the Rename option. I think I'll post again about this when I get some specific information, maybe it's something I installed._________________OB Precise 15.01 kernel 3.17.7|Puppy Linux en español

I've reported before that having a CF card in PCMCIA adapter will stall booting on precise pups (the exception being Pemasu's Upup Precise 3.7.2). Removing the adapter will allow booting to continue, but the USB socket will no longer function. Previously I could insert the card after boot up and there would be no problem, but now the system will either freeze completely or disable the USB port again.
This is from /var/log/messages, and shows what is happening when I re-insert the card: